Java In A Nutshell, 5th Edition

This interface defines a method that creates DatagramSocketImpl objects. You can register an instance of this factory interface with the static setDatagramSocketImplFactory( ) method of DatagramSocket . Application-level code never needs to use or implement this interface.

public interface DatagramSocketImplFactory { // Public Instance Methods DatagramSocketImpl createDatagramSocketImpl ( ); }

Passed To

DatagramSocket.setDatagramSocketImplFactory( )